What Are GLP-1s?
By Dr. Smriti Singh, DO, MPH · Updated October 2026
If you've been researching weight management or blood sugar support, you may have come across the term "GLP-1." This guide explains what a GLP-1 agonist is, how GLP-1 medications generally work, and what to know before considering one.
What Is GLP-1?
GLP-1 stands for glucagon-like peptide-1. This is a hormone that your body produces naturally in the gut, mainly after eating. Common examples include semaglutide (sold as Ozempic for type 2 diabetes and Wegovy for weight management), tirzepatide (Mounjaro and Zepbound), and liraglutide (Victoza and Saxenda). Tirzepatide works on both the GLP-1 receptor and a second hormone receptor called GIP. GLP-1 plays a role in several processes, including:
Signaling the pancreas to release insulin when blood sugar rises
Slowing down how quickly the stomach empties
Signaling the brain to reduce appetite
Because of these effects, GLP-1 is involved in both blood sugar regulation and feelings of fullness after eating.
What Are GLP-1 Medications?
GLP-1 medications are a class of prescription drugs that mimic the effects of natural GLP-1 in the body. They're designed to activate the same receptors that natural GLP-1 activates, which can affect blood sugar and appetite.
Some GLP-1 medications are FDA-approved for managing blood sugar in type 2 diabetes. Others are FDA-approved specifically for chronic weight management in adults who meet certain medical criteria. Approval, eligibility, and appropriate use vary by specific medication and by individual patient, a licensed provider determines what applies to a given person.
How Are GLP-1 Medications Used?
GLP-1 medications are prescription-only and require:
A medical evaluation including health history and relevant lab work
A prescription from a licensed provider based on individual eligibility and health status
Ongoing monitoring to track response and watch for side effects
Typically, an injectable form, administered on a schedule set by the prescribing provider
They are not available over the counter and are not appropriate for everyone. A provider evaluates each person individually before prescribing.
What Are the Considerations?
Like any prescription medication, GLP-1 medications can have side effects, and they aren't right for every person. Common considerations include:
Possible gastrointestinal side effects, such as nausea, especially when starting treatment
The need for an accurate health history, since certain medical conditions may affect eligibility
Individual variation in response: no medication works identically for everyone
The importance of ongoing follow-up with a prescribing provider
No outcome can be guaranteed, and only a licensed provider can determine if a GLP-1 medication is an appropriate option for a specific person.
Frequently Asked Questions
What does GLP-1 stand for? GLP-1 stands for glucagon-like peptide-1, a hormone your body produces naturally that affects blood sugar and appetite.
Are GLP-1 medications the same as insulin? No. GLP-1 medications work differently than insulin. They affect how the body releases insulin, how quickly the stomach empties, and appetite signals in the brain, rather than replacing insulin directly.
Do I need a prescription for a GLP-1 medication? Yes. GLP-1 medications are prescription-only and require an evaluation by a licensed provider.
What are common side effects? Gastrointestinal side effects, such as nausea, are commonly reported, especially when starting treatment. A provider can explain the full side effect profile of a specific medication.
Are GLP-1 medications approved for weight loss? Some GLP-1 medications are FDA-approved specifically for chronic weight management in adults who meet certain medical criteria. Eligibility is determined by a licensed provider.
What Happens When You Stop? Many people regain weight after stopping a GLP-1, and some of the weight lost during treatment can be muscle rather than fat. That’s why medication alone isn’t the whole plan. At Trailhead Wellness Medicine, Dr. Singh pairs GLP-1 treatment with nutrition and strength training guidance to protect muscle and build habits that last after the medication.
Do I have to take a GLP-1 forever? Not necessarily, but SOME weight regain is common after stopping. A plan for nutrition and muscle-building makes the biggest difference. Direct medical supervision to show you how to maintain your weight while you are on it and slowly tapering off the GLP-1 is the best way to reduce the risk of gaining back a significant amount of weight. This is why Trailhead Wellness Medicine provides close physician supervision.
How long does it take to see results? Most people notice reduced appetite within the first few weeks. Doses are increased gradually, and weight loss typically continues over several months.
This article is for general education only. It is not medical advice and does not replace a conversation with a licensed healthcare provider.